Etymology
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tricuspid (n.)

1660s, from Latin tricuspidem (nominative tricuspis) "three-pointed," from tri- (see tri-) + cuspis "point" (see cusp).

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Definitions of tricuspid

tricuspid (adj.)
having three cusps or points (especially a molar tooth);
tricuspid molar
tricuspid valve
Synonyms: tricuspidate
From wordnet.princeton.edu